Based on what I believe is an On30 model train steam engine and its coal car. It's the same size and level of detail as the model, so if you choose to scale it up for use as an actual train, I can't guarantee the believability.

This one has both the engine and the car setting tracks, which I've thrown in extra.

It comes in Obj, Fbx, Ma, and Mb formats. The Maya files have all the materials used in the renders. Color maps, spec maps, and bump maps are also included. The color and spec maps are fairly simple. In fact, most parts of the models I just used the 'darkPlastic.tif' texture for the color and spec maps.